third one done boom!

MiniString.java

@@ -0,0 +1,68 @@
+public class MiniString {
+   private String str;
+   public MiniString(String str) {
+      this.str = str;
+   }
+   public String makeSubstring(int beginIndex) {
+      int length = this.str.length();
+      String ret = "";
+      for (int i = beginIndex; i < length; i++){
+         ret += this.str.charAt(i);
+      }
+      return ret;
+   }
+   public String makeSubstring(int beginIndex, int endIndex) {
+      int length = this.str.length();
+      String ret = "";
+      for (int i = beginIndex; i < endIndex; i++){
+         ret += this.str.charAt(i);
+      }
+      return ret;
+   }
+   public int findIndexOf(char ch) {
+      int ret = -1;
+      for (int i = 0; i < this.str.length(); i ++ ){
+         if (this.str.charAt(i) == ch) {
+            ret = i;
+            break;
+         }
+      }
+      return ret;
+   }
+   public int findIndexOf(char ch, int fromIndex) {
+      int ret = -1;
+      for (int i = fromIndex; i < this.str.length(); i ++ ){
+         if (this.str.charAt(i) == ch) {
+            ret = i;
+            break;
+         }
+      }
+      return ret;
+   }
+   public int findIndexOf(String str) {
+      int ret = -1;
+      int sub_length = str.length();
+      String cur_str;
+      for (int i = 0; i < this.str.length() - sub_length; i++){
+         cur_str = this.makeSubstring(i,i + sub_length);
+         if (cur_str.equals(str)) {
+            ret = i;
+            break;
+         }
+      }
+      return ret;
+   }  
+   public int findIndexOf(String str, int fromIndex) {
+      int ret = -1;
+      int sub_length = str.length();
+      String cur_str;
+      for (int i = fromIndex; i < this.str.length() - sub_length; i++){
+         cur_str = this.makeSubstring(i,i + sub_length);
+         if (cur_str.equals(str)) {
+            ret = i;
+            break;
+         }
+      }
+      return ret;
+   }
+}

TestStringPractice.java

@@ -1,59 +1,59 @@
-/* 
- * NEIU CS207-2 Fall 2018  
- * Homework 4 TestStringPractice.java
- * This is the class with a main(), to test StringPractice
- */
+ 
+ // * NEIU CS207-2 Fall 2018  
+ // * Homework 4 TestMiniString.java
+ // * This is the class with a main(), to test MiniString
+ 
 public class TestStringPractice
 {
    public static void main(String[] args)
    {
-      StringPractice s1 = new StringPractice("Hello world, welcome to the Java world.");
+      MiniString s1 = new MiniString("Hello world, welcome to the Java world.");
+      
       
-      /*
       System.out.println(s1.makeSubstring(0));
       System.out.println(s1.makeSubstring(6));
       System.out.println(s1.makeSubstring(6, 14));
       System.out.println(s1.makeSubstring(13));
       System.out.println(s1.makeSubstring(0, 12));
       System.out.println();
-      */
+      
 
-      /*
+      
       System.out.println(s1.findIndexOf('w'));
       System.out.println(s1.findIndexOf('m'));
       System.out.println(s1.findIndexOf('x'));
       System.out.println(s1.findIndexOf('J'));
       System.out.println(s1.findIndexOf('a'));
       System.out.println();
-      */
+      
 
-      /*
+      
       System.out.println(s1.findIndexOf('w', 7));
       System.out.println(s1.findIndexOf('m', 20));
       System.out.println(s1.findIndexOf('x', 10));
       System.out.println(s1.findIndexOf('J', 30));
       System.out.println(s1.findIndexOf('a', 30));
       System.out.println();
-      */
+      
 
-      /*
+      
       System.out.println(s1.findIndexOf("wo"));
       System.out.println(s1.findIndexOf("we"));
       System.out.println(s1.findIndexOf("He"));
       System.out.println(s1.findIndexOf("Ja"));
       System.out.println(s1.findIndexOf("va"));
       System.out.println();
-      */
+      
 
-      /*
+      
       System.out.println(s1.findIndexOf("wo", 7));
       System.out.println(s1.findIndexOf("we", 20));
       System.out.println(s1.findIndexOf("He", 10));
       System.out.println(s1.findIndexOf("Ja", 30));
       System.out.println(s1.findIndexOf("va", 25));
       System.out.println();
-      */
+      
       
    } // End main() 
    
-} // End class TestStringPractice
+} // End class TestMiniString